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annotate libtwamr/agc.h @ 478:936a08cc73ce

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doc/AMR-library-API: describe the decoder
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 19 May 2024 21:32:31 +0000
parents 6b33f3ba4289
children
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1 /*
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2 *****************************************************************************
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3 *
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4 * GSM AMR-NB speech codec R98 Version 7.6.0 December 12, 2001
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5 * R99 Version 3.3.0
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6 * REL-4 Version 4.1.0
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7 *
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8 *****************************************************************************
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9 *
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10 * File : agc.h
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11 * Purpose : Scales the postfilter output on a subframe basis
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12 * : by automatic control of the subframe gain.
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13 *
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14 *****************************************************************************
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15 */
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16 #ifndef agc_h
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17 #define agc_h "$Id $"
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18
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19 /*
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20 *****************************************************************************
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21 * INCLUDE FILES
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22 *****************************************************************************
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23 */
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24 #include "typedef.h"
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25
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26 /*
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27 *****************************************************************************
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28 * DEFINITION OF DATA TYPES
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29 *****************************************************************************
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30 */
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31 typedef struct {
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32 Word16 past_gain;
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33 } agcState;
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34
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35 /*
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36 *****************************************************************************
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37 * DECLARATION OF PROTOTYPES
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38 *****************************************************************************
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39 */
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40 /*
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41 **************************************************************************
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42 *
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43 * Function : agc_reset
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44 * Purpose : Reset of agc (i.e. set state memory to 1.0)
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45 * Returns : 0 on success
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46 *
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47 **************************************************************************
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48 */
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49 void agc_reset (agcState *st);
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50
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51 /*
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52 **************************************************************************
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53 *
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54 * Function : agc
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55 * Purpose : Scales the postfilter output on a subframe basis
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56 * Description : sig_out[n] = sig_out[n] * gain[n];
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57 * where gain[n] is the gain at the nth sample given by
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58 * gain[n] = agc_fac * gain[n-1] + (1 - agc_fac) g_in/g_out
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59 * g_in/g_out is the square root of the ratio of energy at
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60 * the input and output of the postfilter.
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61 *
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62 **************************************************************************
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63 */
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64 int agc (
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65 agcState *st, /* i/o : agc state */
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66 Word16 *sig_in, /* i : postfilter input signal, (l_trm) */
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67 Word16 *sig_out, /* i/o : postfilter output signal, (l_trm) */
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68 Word16 agc_fac, /* i : AGC factor */
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69 Word16 l_trm /* i : subframe size */
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70 );
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71
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72 /*
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73 **************************************************************************
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74 *
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75 * Function: agc2
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76 * Purpose: Scales the excitation on a subframe basis
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77 *
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78 **************************************************************************
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79 */
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80 void agc2 (
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81 Word16 *sig_in, /* i : postfilter input signal */
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82 Word16 *sig_out, /* i/o : postfilter output signal */
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83 Word16 l_trm /* i : subframe size */
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84 );
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85
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86 #endif